'use strict';

function even_to_letter(collection) 
{
  let  collectionA=[];
  let collectionC=[];
  for (let i=0;i<collection.length;i++ )
    {
      if (collection[i]%2==0)
        collectionA.push(collection[i]);
    }
  let collectionB=['a','b','c','d','e','f','g','h','i','j','k','l','m','n'];
  for (let i=0;i<collectionA.length;i++)
    {
      collectionC.push(collectionB[collectionA[i]-1]);
    }
  return collectionC;
}

module.exports = even_to_letter;
